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tac:tldr:3cf73
tac: Use a separator [b]efore each file.
$ tac -b ${filename1 filename2 ---}
try on your machine
The tac
command is used in Linux/Unix systems to reverse the order of lines in a given file(s). The -b
option is not a valid option for the tac
command, so assuming it's a placeholder meant to represent the actual filenames.
The command tac -b ${filename1 filename2 ---}
likely intends to reverse the order of lines in multiple files. However, the placeholders ${filename1 filename2 ---}
are not valid syntax.
To use the tac
command properly, you should replace ${filename1 filename2 ---}
with the actual filenames you want to reverse. The command would look like:
tac file1.txt file2.txt
This would reverse the order of lines in both file1.txt
and file2.txt
and display the result.
This explanation was created by an AI. In most cases those are correct. But please always be careful and
never run a command you are not sure if it is safe.